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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

USB-Blaster: Unable to read device chain - JTAG chain broken

I'm using Ubuntu14.04 and quartus14.1. When I run jtagconfig, I get: $ jtagconfig 1) USB-Blaster [3-6] Unable to read device chain - JTAG chain broken The hardware is correct becaus...
rthomp's avatar
rthomp
Icon for New Contributor rankNew Contributor
3 years ago

My problem stemmed from UDEV rules. Below are my steps to circumvent the issue.

Only need to do once

Copy the following into /etc/udev/rules.d/92-usbblaster.rules simply copy the attached rules as /etc/udev/rules.d/92-usbblaster.rules

# For Altera USB-Blaster permissions:

# USB-Blaster
SUBSYSTEM=="usb", ATTRS{idVendor}=="09fb", ATTRS{idProduct}=="6001", MODE="0666", GROUP="plugdev"
SUBSYSTEM=="usb", ATTRS{idVendor}=="09fb", ATTRS{idProduct}=="6002", MODE="0666", GROUP="plugdev"
SUBSYSTEM=="usb", ATTRS{idVendor}=="09fb", ATTRS{idProduct}=="6003", MODE="0666", GROUP="plugdev"

# USB-Blaster II
SUBSYSTEM=="usb", ATTRS{idVendor}=="09fb", ATTRS{idProduct}=="6010", MODE="0666", GROUP="plugdev"
SUBSYSTEM=="usb", ATTRS{idVendor}=="09fb", ATTRS{idProduct}=="6810", MODE="0666", GROUP="plugdev"

(I read that 92 mattered somewhere as it needed to be larger than one of the other rule numbers. I understand that Intel claims 51 should be sufficient. Please correct me here if someone knows more about this.)

You will have to do this again when necessary

1. Run service udev restart

2. Replug in all associated USB devices.
After a few retries, I realized the USB-C adapter
needed to be reinserted along with the the USB Blaster